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ISL94203

Obsolete

3-to-8 Cell Li-ion Battery Pack Monitor

Alternative(s) Available
ISL94202 - Standalone 3 to 8 Cell Li-Ion Battery Pack Monitor
  • Notes:The ISL94203 is not recommended for new designs. The recommended replacement is ISL94202.

Features

  • Eight cell voltage monitors support Li-ion CoO2, Li-ion Mn2O4 and Li-ion FePO4 chemistries
  • Stand-alone pack control - no microcontroller needed
  • Multiple voltage protection options (each programmable to 4.8V; 12-bit digital value) and selectable overcurrent protection levels
  • Programmable detection/recovery times for overvoltage, undervoltage, overcurrent and short-circuit conditions
  • Configuration/calibration registers maintained in EEPROM
  • Open battery connect detection
  • Integrated charge/discharge FET drive circuitry with built-in charge pump supports high-side N-channel FETs
  • Cell balancing uses external FETs with internal state machine or external microcontroller
  • Enters low power states after periods of inactivity. Charge or discharge current detection resumes normal scan rates
ISL94203 Functional Diagram
ISL94203 Functional Diagram

Description

The ISL94203 is a Li-ion battery monitor IC that supports from 3 to 8 series connected cells. It provides full battery monitoring and pack control. The ISL94203 provides automatic shutdown and recovery from out of bounds conditions and automatically controls pack cell balancing. The ISL94203 is highly configurable as a stand-alone unit, but can be used with an external microcontroller, which communicates to the IC through an I2C interface.

Applications

  • Power tools
  • Battery back-up systems
  • E-bikes
Part NumberStatusSamplesStockRoHSPackageCarrier Type
ISL94203IRTZObsoleteN/AIn StockRoHS:EN
TQFNTube
ISL94203IRTZ-TObsoleteN/AOut of StockRoHS:EN
TQFNReel
ISL94203IRTZ-T7ObsoleteN/AIn StockRoHS:EN
TQFNReel
ISL94203IRTZ-T7AObsoleteN/AIn StockRoHS:EN
TQFNReel
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Filters

    Recommended Documents (1)

  1. Datasheet
    ISL94203 Datasheet
    RECOMMENDED
    PDF 2.92 MB isl94203 Dec 11, 2018

    Datasheets (1)

  1. Datasheet
    ISL94203 Datasheet
    RECOMMENDED
    PDF 2.92 MB isl94203 Dec 11, 2018

    Application Notes & White Papers (4)

  1. White Paper
    Putting Safety into Li-ion Battery Packs
    PDF 451 KB li-ion-battery-pack-safety 简体中文 Oct 28, 2020
    The power FET is an essential safety function in a battery management system (BMS). The main purpose of the power FET is to isolate the battery pack from either a load or a charger in errant conditions. This white paper discusses the detection blocks and how they apply to the state of the power FETs to ensure safe operation of lithium ion (Li-ion) battery packs.
  2. White Paper
    Battery Management System Tutorial
    PDF 451 KB battery-management-system-tutorial 简体中文 Aug 09, 2018
    Advancements in battery technology have enabled lighter, more efficient power sources for devices ranging from portable tools to electric vehicles. This paper introduces battery management system (BMS) architecture and explains the key functional blocks involved. It guides designers in selecting the appropriate design and components to optimize battery performance and extend battery life based on application needs.
  3. Application Note
    AN1684: Nonideality of Ground
    PDF 397 KB an1684 Jan 19, 2004
    AI-generated Summary: The document outlines important legal disclaimers and usage guidelines for semiconductor products. It emphasizes user responsibility for product design and safety, disclaims liability for damages, and clarifies no intellectual property licenses are granted. Products are categorized by quality grades with specific application recommendations. Users must comply with laws, avoid unauthorized modifications, and ensure safe use within specified conditions. Contact details for Renesas Electronics sales offices worldwide are provided.
  4. Application Note
    AN1681: Grounding Techniques
    PDF 509 KB an1681 Jan 19, 2004
    AI-generated Summary: The document explains grounding techniques for PCB layouts using a dual op amp example on a single-layer copper board. It compares three grounding schemes: a center spine ground trace, an outer ground plane, and a split/star ground plane, highlighting the benefits of single-point grounding to minimize noise and antenna effects. It emphasizes following current paths, minimizing loop lengths, and ensuring close forward and return paths to reduce interference. The document also includes disclaimers on product use, quality grades, safety, and legal compliance.

    Product Notices (PCN, EOL, etc) (1)

  1. Product Change Notice
    PCN15011 - ISL94203 design change
    PDF 94 KB PCN15011 Feb 13, 2015

    Marketing Collateral (1)

  1. Brochure
    Analog ICs Brochure
    PDF 5.43 MB R07CL0009EJ0800 Rev.8.00 日本語 Nov 10, 2025
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Support Communities

  1. ISL94202EVKIT1Z not detected

    I just received your ISL94202EVKIT1Z.  Couple issues. The kit came with a iso-dongle-ev1z Rev C PCB.  I cannot find any documentation for Rev C of this board. The kit came with a USB dongle. One of the files is: REN_isl94203evkit1z-software_LBR_20171117.exeWhen I run this ...

    Apr 28, 2026
  2. Can we use ISODONGLE1Z for ISL94216

    I have ISODONGLE1Z to program ISL94216 can i use it. I am trying to use it but the GUI for 94216 is not detecting this dongle

    Aug 26, 2022

Knowledge Base

  1. Do the ISL94203 and ISL94202 have the same data sheet specifications for accuracy and timing?

    Question: Do the ISL94203 and ISL94202 have the same data sheet specifications for accuracy and timing?   Answer: Yes.   Go to Japanese

  2. Will the ISL94203 GUI software for the ISL94203 evaluation board work with the ISL94202 device?

    Question: Will the ISL94203 GUI software for the ISL94203 evaluation board work with the ISL94202 device?    Answer: Yes.   Go to Japanese

  3. What are the differences between the ISL94202 and the ISL94203?

    ... for pin and package compatible with the ISL94203.  If you have already designed in the ISL94203 and change to the ISL94202, the ISL94202 register and EEPROM arrangement is bit for bit compatible with the ISL94203. The communications interface is also compatible between the ISL94203 and ISL94202. Suitable Products ISL94202, ISL94203

    Sep 26, 2025
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